Pull switch



Nov. 6, 1928.

1,690,366l D. D. GORDCN PULL SWITCH Filed Feb. 15, 1926 faam@ UNITE-DSTATES DAVID D; GORDON, OF CHICAGO, ILLINOIS,

1,690,366 YPATENT OFFICE,y

ASSIGNOR T ECONOMY FUSE ANDMNU- PAUIURING COMPANY, OF CHICAGO,ILLINOIS,`A CORPORATION OF NEW YORK.

PULL SWITCH.

f" Application flied February y The present inventionrelates t-oyimprovements in pull switches;

More particularly the present invention relates' tomelectricswitches ofthe pull socket type, wherein it is desirable that successive pulls inthe samel general direction upon a chain or other operating member willresult in the Successive making and `breaking of an electric cire-uit,

An object of the present invention is to provide app-pull soeketwhich issimple and cheap to' construct. Y

A further Objectis to provide af pull socket n which is sturdy andre'liablein service.

' furtherhobject is to' provide an improved 'pull socket in "whichswitching is accom.-

lplished with a snapaction.` f f A Further objects Wi'llappear as tionproceeds.

the descrip- Referring tothe draivyings- Y' i Y Figure 1 isa View inside elevation of av `Pull Socket; a f ,y a Figure 2 `islalongitudinalsectional view "ofthe structure shown in Figure 1, Figure 2 being on a`larger scale than is Figure 1 g Figure 3 is a transverse sectional viewtakenalong the plane indicated by the `arrows `j3--3`of Figure 2, theswitch parts being shown ,y in one biased position; y

i Figure `if` is a view similar to Figure 3, but showing the switchparts in their' alternative biased` position and y Y Figure 5 -is'a viewshowing a portion of the structure illustrated in Figure 3, the partsbeing shown independently ofthe other structure in FigureB fory purposesof clarity.

l TheV numeral 1() indicates aI casing or shell which may be providedwith the cap 11.' The bell mouth 12 providesv a guide forthefpullmemberl, whichis indicated in the form of Ia chain. It will befclear, ofcourse, that the operating member 13 may take any other preferred forni.y y

,The shell is provided on its interior With the insulating sleeve '14,Whichhouses the screw-threaded conducting sleeve 15. Mounted centrallyof theconducting sleeve 15, but

insulated therefrom, is the usual' center contact 16.,` The numeral 17indicatesa conducting member which may have the double' functionofholding the sleeve 15 in place 4and forming an electrical connectionbetween said sleeve 15 and one of the two Wires of electrie circuit.vThe connection between said member' '1 7 anda binding screfvv such as's15, 1926. Serial N0. 88,174.

ordinarily provided in electric light sockets is not shown, inasmuch assuch a showing'is not necessary for a complete understanding of theinvf-intion.` `The other side of the electric circuit referred to isconnected to the conducting pin 18, which is carried by a; member 19 ofinsulatingT material. Cooperating with the pin 18 and in alignmenttherewith is the conducting pin 20, which is 'connected tothe ,centercontact 16 and electrically `ifsu-l-ated from the sleeve 15. The member2l disposed above the sleeve 15 and'suitably supportedv from theinsulating member 19j1`fnay vfoi-"mf a support for said contact pin 20.Said'mem- Vbei-21 also forms'a support ier certain switching mechanismindica-ted as af Whole by' the numeral 22, which switching'mechanismeooper'ates with the aligned'pi-ns 18 and 20. It will be clear that whenthe aligned pins`18 and 20 are bridged by zin-electric conductor,

the circuit of the electric socket Will be coinplete, assuming ofcoursethat' a translating `device or other means is in use to connect thesleeve 15 and center Contact 16. 1

For the! purpose of providingai` bridge be` tween the aligned Contactpins 18 and Q0,a

"25, the limits ot'said movement being defined `by the aligned Contactpins 18 andQO the one side Aand by the stop 26 on the other side. y Forthe purpose of selectably positioning the contact meniber 23". certain`control mechanism' [is provided, which `will vnouv be `described.Carried bythe supp'ortii1gv `member 9.4 for swinging movement about theaxis 25 is the U-shapedmember 27 `havingthetvvo, pins 28 and `29projecting from' the upper eX- tremity thereof. rIjhel pin 28 providesa. pivot pin 'for the yoke member or operating niember 30, which yokemember has the 'tWo legs 31-31, which legs B11-31 are adapted toreceive`between them the pin 29. The outer extremity of the yoke 30 formsaconnect'ion for the pull member 18. Stops-SQ are pro vided which deinethe Vlimits of the' swinging movement of the U-shaped member Stops33e-33 Aare also provided, which definev the limits of the swingingmovement of thefyoke 30.

A tension spring 34 is provided-for"attachL ment to the outerextremities of the U-shaped members and 27, said spring normally tendingto draw together the base portions of said U-shaped members Q3 and 2T.It will be clear that said spring 3J: will selectably bias the U-shapedmember 23 either toward the contact member :'20 or the stop 2G,depending upon the position of said spring 3l relative to the axis 2oabout which said U-shaped member 23 swings. The showing of the spring 3ihas been omitted from Figures 3 and i in order that the drawing ma): notbe complicated by a nmltiplicity of lines. The line oi' action et saidspring is indicated, however, in said ligures b;V the broken line 349.

The mode oi' operation ot' the above described embodiment. oi' thepresent invention is as follows. Starting with the parts as indicated inFigure 3, it will be clear that the spring 34, acting along the lineindicated by the numeral 34a, will hold the U-shaped members 2iand 2i'against the pin 2O and lower stop 32, respectively. B v reason ot thefact that the contact pin 2O is in alignment with the contact pin 28, abridgin relationship is established at this time between said contactpins Q0 and 18. At this time the yoke 30 is disposed with the upper leg31 thereof in engagement with the pin 29, which pin, as noted above, iscarried by the U-shaped member. In this position the pull member 13 isdisposed upwardly, as the parts are viewed in Figure 3, of the pivotalaxis 28 o' the yoke 30. A pull upon the pull member 13 will thereforetend to swing the yoke 30 in a counter-clockwise direction about. thepivotal axis Q8. This action will tend to raise the U-shaped member 27,as the parts are viewed in Figure 3, until the line ot action 34 ot thespring 34 is above the axis at which time said U-shaped members 23 and2T will be snapped by the spring 3i into engagement. with the stop 2Gand upper stop 32. respectively, thereby breaking the bridgingrelationship between the. contact pins Y1S and 20. The upper stop 33will limit the counterclockwise movement o't the yoke member 30, andwhen the U-shaped member Q7 has been moved, as above described, intoengagement with the upper stop 32, the relative positions of the yokemember 3() and U-shaped member 2T will be changed to that shown inFigure 4, wherein the lower leg 31 of said voke 30 is in engagement withthe pin 2). At this time the line of action of the pull member i3 willbe below the axis 25 as the parts are viewed in Figures 3 and 4. Thenext pull upon the member 13 will therefore tend to move the U-shapedmember 9.7 in a clockwise direction against the lower stop 3Q, resultingin the movement of the parts back to the positions shown in Figure 3.

The above described cycle of operation is performed with a minmum ofparts which may be cheaply constructed and cheaply assembled and whichwill stand up well in service.

Though a prel'erred embodiment ol the present invention has beendescribed in detail, man3' modiiications will occur to those skilled inthe art. It is intended to cover all such modilications that fall withinthe scope of the appended claims.

I claim:

l. A pull switch comprising, in combination, a supporting member. a pairof swinging members supported thereby, a spring biasing the outerextremities o t said swingingr members toward each other, one ol" saidswinging members comprising an electrical conductor, stops for limitingthe swinging m vement of said swinging n'ieinbers, one of said swingingmembers having an operating member pivotally supported thereby, saidoperating member having spaced portions adapted to abut against itscorresponding swinging member to change the relative positions of saidswinging members.

2. A pull switch comprising, in combination, a supporting member, a pairof swinging members supported thereby, a spring biasing the outerextremities of said swinging members toward each other, one of saidswinging members comprising an electrical conductor, stops for limitingthe swinging movement of said swinging members, one of said swingingmembers having an operating member pivotally supported thereby, saidoperating member having spaced portions adapted to abut against itscorresponding swinging member to change the relative positions of saidswinging members, and stop means for said operating ,men'iber torchanging the position of said operating member relative to itscorresponding swinging member.

3. ln a pull switch, in cmnbination, supporting means, a pair offswinging members having a common axis supported by said su iportingmember, spring means For biasing t e outer extremities of said swingingmeml'iers toward each other, stops for limiting the swinging movement oieach o't said swinging members. one oi said swinging members having anoperating member pivoted thereto near the outer extremityy thereof, saidoperating member having spaced operating )ortions adapted to abutagainst a portion o the corresponding swinging member to move saidswinging member in opposition to said spring means, and st op membersfor engaging said operating member to change the position ot' saidoperating member relative to its corresponding swinging member.

4. In a pull switch, in combination, supporting means, a pair ofswinging members having a common axis supported by said supportingmember, spring means for biasing the outer extremities of said swingingmembers toward each other, stops for limiting the lll) swinging movementof each of said swinging members, one of said swinging members having anoperating member pivoted thereto near the outer extremity thereof, saidoperating member having spaced operating ortions adapted to `abutagainst a. portion o the corresponding swinging member to move saidswinging member in opposition to said spring means.

5. In a pull switch, in combination, a supporting member,"a pair ofswinging members supported thereby about a common axis, stops forlimiting the movement of said swinging members, a spring for biasingsaid swinging members selectably against oneset of stopsor against theother set of stops, an

operating member' swingingly carried by one of said'swinging members,said operating member having spaced operating portions` adapted to abutagainst a portion of the corresponding swinging member to move saidswinging member in opposition to said spring, a pull member forcontrolling said operating member, and stops adapted to be engaged bysaid operating member for changing the position of said operatingmemberY whereby to move the line of operation of said push member fromone side to the other of said aXiS.

Signed at Chicago, Illinois, this 10th day of February, 1926. Y

DAVID D. GORDON.

